Automotive Air Conditioning Information Forum

Is there someplace online I can look up (and buy) the correct high and low side Schrader valves for my vehicle? Or do I need to buy one of those 100-piece kits that has one of every size? The local auto parts stores are clueless.
Application is 2008 Chrysler Town & Country. Thanks

If you can not find one in the parts store, try the dealer. They can not be that expensive thru the stealership.